001 /* 002 * $Id: NewStaticMetaMethod.java 4550 2006-12-21 22:22:40Z blackdrag $ 003 * 004 * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 005 * 006 * Redistribution and use of this software and associated documentation 007 * ("Software"), with or without modification, are permitted provided that the 008 * following conditions are met: 009 * 1. Redistributions of source code must retain copyright statements and 010 * notices. Redistributions must also contain a copy of this document. 011 * 2. Redistributions in binary form must reproduce the above copyright 012 * notice, this list of conditions and the following disclaimer in the 013 * documentation and/or other materials provided with the distribution. 014 * 3. The name "groovy" must not be used to endorse or promote products 015 * derived from this Software without prior written permission of The Codehaus. 016 * For written permission, please contact info@codehaus.org. 017 * 4. Products derived from this Software may not be called "groovy" nor may 018 * "groovy" appear in their names without prior written permission of The 019 * Codehaus. "groovy" is a registered trademark of The Codehaus. 020 * 5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/ 021 * 022 * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY 023 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 024 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 025 * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR 026 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 027 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 028 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 029 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 030 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 031 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 032 * DAMAGE. 033 * 034 */ 035 package org.codehaus.groovy.runtime; 036 037 import groovy.lang.MetaMethod; 038 039 /** 040 * A MetaMethod implementation where the underlying method is really a static 041 * helper method on some class. 042 * 043 * This implementation is used to add new static methods to the JDK writing them as normal 044 * static methods with the first parameter being the class on which the method is added. 045 * 046 * @author Guillaume Laforge 047 * @version $Revision: 4550 $ 048 */ 049 public class NewStaticMetaMethod extends MetaMethod { 050 051 private static final Class[] EMPTY_TYPE_ARRAY = {}; 052 053 private MetaMethod metaMethod; 054 private Class[] logicalParameterTypes; 055 056 public NewStaticMetaMethod(MetaMethod metaMethod) { 057 super(metaMethod); 058 this.metaMethod = metaMethod; 059 init(); 060 } 061 062 public NewStaticMetaMethod(String name, Class declaringClass, Class[] parameterTypes, Class returnType, int modifiers) { 063 super(name, declaringClass, parameterTypes, returnType, modifiers); 064 this.metaMethod = new MetaMethod(name, declaringClass, parameterTypes,returnType, modifiers); 065 init(); 066 } 067 068 private void init() { 069 Class[] realParameterTypes = metaMethod.getParameterTypes(); 070 int size = realParameterTypes!=null ? realParameterTypes.length : 0; 071 if (size <= 1) { 072 logicalParameterTypes = EMPTY_TYPE_ARRAY; 073 } else { 074 logicalParameterTypes = new Class[--size]; 075 System.arraycopy(realParameterTypes, 1, logicalParameterTypes, 0, size); 076 } 077 } 078 079 public Class getDeclaringClass() { 080 return getBytecodeParameterTypes()[0]; 081 } 082 083 public boolean isStatic() { 084 return true; 085 } 086 087 public int getModifiers() { 088 return super.getModifiers(); 089 } 090 091 public Class[] getParameterTypes() { 092 return logicalParameterTypes; 093 } 094 095 public Class[] getBytecodeParameterTypes() { 096 return super.getParameterTypes(); 097 } 098 099 public Object invoke(Object object, Object[] arguments) { 100 int size = arguments.length; 101 Object[] newArguments = new Object[size + 1]; 102 System.arraycopy(arguments, 0, newArguments, 1, size); 103 newArguments[0] = null; 104 return metaMethod.invoke(null, newArguments); 105 } 106 }